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有關外接eeprom 的問題
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中級會員
 
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使用環境：MPLAB V8.36 MCC18 V3.31 ICD3 PIC18F24J50
CONFIG 設定(XMAL=12MHZ) EEPROM是用MX25L8005 使用spi2 把接腳用pps印射到接腳 OpenSPI2(SPI_FOSC_4 , MODE_00, SMPMID); OUT_PIN_PPS_RP11 = OUT_FN_PPS_SCK2; OUT_PIN_PPS_RP12 = OUT_FN_PPS_SDO2; IN_FN_PPS_SDI2 = IN_PIN_PPS_RP13; IN_FN_PPS_SCK2IN = IN_PIN_PPS_RP11; 現在已經用示波器讀出SDK、SDO的資料，但回傳的資料都是0X00。 請問還有哪些需要注意的? 以下是我的程式 void EEP_WREN(void) { EEP_CS LOW; WriteSPI2(WREN); EEP_CS HIGH; } void EEP_WRDI(void) { EEP_CS LOW; WriteSPI2(WRDI); EEP_CS HIGH; } void EEP_SE(void) { EEP_WREN(); EEP_CS LOW; WriteSPI2(SE); WriteSPI2(0x00); //位子0X000000 WriteSPI2(0x00); WriteSPI2(0x00); EEP_CS HIGH; delay_ms(60); } unsigned char EEP_READ(void) { char worr; int hunter; EEP_CS LOW; WriteSPI2(READ); WriteSPI2(0x00); WriteSPI2(0x00); WriteSPI2(0x00); worr = ReadSPI2(); EEP_CS HIGH; return worr; } void EEP_WRITE(unsigned char Rog) { int a; EEP_WREN(); EEP_CS LOW; WriteSPI2(WRITE); WriteSPI2(0x00); WriteSPI2(0x00); WriteSPI2(0x00); WriteSPI2(Rog); EEP_CS HIGH; EEP_WRDI(); }
發表於: 2009/11/9 10:09
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